P-synephrine, also known as 1-(4-hydroxyphenyl)-2-(methylamino)ethanol or oxedrine, is a member of the class of compounds known as 1-hydroxy-2-unsubstituted benzenoids. 1-hydroxy-2-unsubstituted benzenoids are phenols that a unsubstituted at the 2-position. P-synephrine is soluble (in water) and a very weakly acidic compound (based on its pKa). P-synephrine can be found primarily in blood and urine. Moreover, P-synephrine is found to be associated with hypertension.